new code of generating hidden layer input

source/sample/fnnlm/FNNLM.cpp

@@ -933,6 +933,7 @@ void FBInOne(XTensor inputs[], XTensor &output, XTensor &gold,
 
     /* input of the first hidden layer */
     hidden = Split(embeddingBig, 0, n - 1);
+    hidden = Merge(hidden, 2, 0);
 
     /* hidden layers */
     for(int i = 0; i < depth; i++){